keratoacanthoma

Medical Dictionary

keratoacanthoma ker·a·to·ac·an·tho·ma (kěr'ə-tō-āk'ən-thō'mə)
n.
A rapidly growing skin tumor having a central keratin mass and usually occurring on exposed areas, invading the dermis but remaining localized and usually healing spontaneously.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
keratoacanthoma

noun
skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar 
WordNet® 3.0, © 2006 by Princeton University.
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